package com.ly.common.utils.file;

import java.io.File;
import java.io.IOException;

import com.ly.common.config.ErpConfig;
import com.ly.common.config.HuaWeiConfig;
import com.ly.common.config.NginxConfig;
import com.ly.common.constant.Constants;
import com.ly.common.exception.file.FileNameLengthLimitExceededException;
import com.ly.common.exception.file.FileSizeLimitExceededException;
import com.ly.common.exception.file.InvalidExtensionException;
import com.ly.common.utils.DateUtils;
import com.ly.common.utils.StringUtils;
import com.ly.common.utils.uuid.IdUtils;
import org.apache.commons.io.FilenameUtils;
import org.springframework.web.multipart.MultipartFile;

/**
 * 文件上传工具类
 * @author ruoyi
 */
public class FileUploadUtils {
    /**
     * 默认大小 50M
     */
    public static final long DEFAULT_MAX_SIZE = 50 * 1024 * 1024;

    /**
     * 默认的文件名最大长度 100
     */
    public static final int DEFAULT_FILE_NAME_LENGTH = 100;

    /**
     * 默认上传的地址
     */
    private static String defaultBaseDir = ErpConfig.getProfile ();

    public static void setDefaultBaseDir (String defaultBaseDir) {
        FileUploadUtils.defaultBaseDir = defaultBaseDir;
    }

    public static String getDefaultBaseDir () {
        return defaultBaseDir;
    }

    /**
     * 以默认配置进行文件上传
     * @param file 上传的文件
     * @return 文件名称
     * @throws Exception
     */
    public static final String upload (MultipartFile file) throws IOException {
        try {
            return upload ( getDefaultBaseDir (), file, MimeTypeUtils.DEFAULT_ALLOWED_EXTENSION );
        } catch ( Exception e ) {
            throw new IOException ( e.getMessage (), e );
        }
    }

    /**
     * 根据文件路径上传
     * @param baseDir 相对应用的基目录
     * @param file    上传的文件
     * @return 文件名称
     * @throws IOException
     */
    public static final String upload (String baseDir, MultipartFile file) throws IOException {
        try {
            return upload ( baseDir, file, MimeTypeUtils.DEFAULT_ALLOWED_EXTENSION );
        } catch ( Exception e ) {
            throw new IOException ( e.getMessage (), e );
        }
    }

    /**
     * 文件上传
     * @param baseDir          相对应用的基目录
     * @param file             上传的文件
     * @param allowedExtension 上传文件类型
     * @return 返回上传成功的文件名
     * @throws FileSizeLimitExceededException       如果超出最大大小
     * @throws FileNameLengthLimitExceededException 文件名太长
     * @throws IOException                          比如读写文件出错时
     * @throws InvalidExtensionException            文件校验异常
     */
    public static final String upload (String baseDir, MultipartFile file, String[] allowedExtension)
            throws FileSizeLimitExceededException, IOException, FileNameLengthLimitExceededException,
            InvalidExtensionException {
        int fileNamelength = file.getOriginalFilename ().length ();
        if ( fileNamelength > FileUploadUtils.DEFAULT_FILE_NAME_LENGTH ) {
            throw new FileNameLengthLimitExceededException ( FileUploadUtils.DEFAULT_FILE_NAME_LENGTH );
        }

        assertAllowed ( file, allowedExtension );

        String fileName = extractFilename ( file );

        String pathFileName = saveFile ( baseDir, fileName, file );
        return pathFileName;
    }

    public static String saveFile (String baseDir, String fileName, MultipartFile file) throws IOException {
        String pathFileName = null;
        if ( HuaWeiConfig.isEnabled () ) {
            pathFileName = HuaWeiConfig.saveHuaWeiOBS ( baseDir, fileName, file );
        } else if ( NginxConfig.isEnabled () ) {
            pathFileName = saveNginx ( baseDir, fileName, file );
        } else {
            pathFileName = saveTheLocal ( baseDir, fileName, file );
        }
        return pathFileName;
    }


    public static String saveTheLocal (String baseDir, String fileName, MultipartFile file) throws IOException {
        File desc = getAbsoluteFile ( baseDir, fileName );
        file.transferTo ( desc );
        return getPathFileName ( baseDir, fileName );
    }

    public static String saveNginx (String baseDir, String fileName, MultipartFile file) throws IOException {
        File desc = getAbsoluteFile ( NginxConfig.getPath () + baseDir, fileName );
        file.transferTo ( desc );
        return NginxConfig.getUrl () + getPathFileName ( NginxConfig.getPath () + baseDir, fileName );
    }


    /**
     * 编码文件名
     */
    public static final String extractFilename (MultipartFile file) {
        String fileName = file.getOriginalFilename ();
        String extension = getExtension ( file );
        fileName = DateUtils.datePath () + "/" + IdUtils.fastUUID () + "." + extension;
        return fileName;
    }

    private static final File getAbsoluteFile (String uploadDir, String fileName) throws IOException {
        File desc = new File ( uploadDir + File.separator + fileName );

        if ( ! desc.getParentFile ().exists () ) {
            desc.getParentFile ().mkdirs ();
        }
        if ( ! desc.exists () ) {
            desc.createNewFile ();
        }
        return desc;
    }

    private static final String getPathFileName (String uploadDir, String fileName) throws IOException {
        int dirLastIndex = ErpConfig.getProfile ().length () + 1;
        String currentDir = StringUtils.substring ( uploadDir, dirLastIndex );
        String pathFileName = Constants.RESOURCE_PREFIX + "/" + currentDir + "/" + fileName;
        return pathFileName;
    }

    /**
     * 文件大小校验
     * @param file 上传的文件
     * @return
     * @throws FileSizeLimitExceededException 如果超出最大大小
     * @throws InvalidExtensionException
     */
    public static final void assertAllowed (MultipartFile file, String[] allowedExtension)
            throws FileSizeLimitExceededException, InvalidExtensionException {
        long size = file.getSize ();
        if ( DEFAULT_MAX_SIZE != - 1 && size > DEFAULT_MAX_SIZE ) {
            throw new FileSizeLimitExceededException ( DEFAULT_MAX_SIZE / 1024 / 1024 );
        }

        String fileName = file.getOriginalFilename ();
        String extension = getExtension ( file );
        if ( allowedExtension != null && ! isAllowedExtension ( extension, allowedExtension ) ) {
            if ( allowedExtension == MimeTypeUtils.IMAGE_EXTENSION ) {
                throw new InvalidExtensionException.InvalidImageExtensionException ( allowedExtension, extension,
                                                                                     fileName );
            } else if ( allowedExtension == MimeTypeUtils.FLASH_EXTENSION ) {
                throw new InvalidExtensionException.InvalidFlashExtensionException ( allowedExtension, extension,
                                                                                     fileName );
            } else if ( allowedExtension == MimeTypeUtils.MEDIA_EXTENSION ) {
                throw new InvalidExtensionException.InvalidMediaExtensionException ( allowedExtension, extension,
                                                                                     fileName );
            } else {
                throw new InvalidExtensionException ( allowedExtension, extension, fileName );
            }
        }

    }

    /**
     * 判断MIME类型是否是允许的MIME类型
     * @param extension
     * @param allowedExtension
     * @return
     */
    public static final boolean isAllowedExtension (String extension, String[] allowedExtension) {
        for ( String str : allowedExtension ) {
            if ( str.equalsIgnoreCase ( extension ) ) {
                return true;
            }
        }
        return false;
    }

    /**
     * 获取文件名的后缀
     * @param file 表单文件
     * @return 后缀名
     */
    public static final String getExtension (MultipartFile file) {
        String extension = FilenameUtils.getExtension ( file.getOriginalFilename () );
        if ( StringUtils.isEmpty ( extension ) ) {
            extension = MimeTypeUtils.getExtension ( file.getContentType () );
        }
        return extension;
    }
}
